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Update comment. 

Red Hat, at one point, provided a /usr/include/pcap/pcap.h without
bothering to also provide a /usr/include/pcap.h that linked to it or
included it, breaking source compatibility.  That's what we're working
around when we search in both the top-level include directories and, if
they exist, pcap subdirectories of those directories.

libpcap 1.0 and later also put pcap.h in a pcap subdirectory, but also
provided a pcap.h in the top-level include directory that included
pcap/pcap.h, preserving source compatibility, so that's not the reason
we're searching in the top-level include directories and their pcap
subdirectories.

Change-Id: I8f427d46ce8293d278be9005ee623cda1ea5d691
Reviewed-on: https://code.wireshark.org/review/23902
Reviewed-by: Guy Harris <guy@alum.mit.edu>
This commit is contained in:
Guy Harris 2017-10-14 11:55:58 -07:00
parent 0943d6ee9d
commit c2f1ab1cbc
1 changed files with 2 additions and 1 deletions
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acinclude.m4
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@ -195,7 +195,8 @@ AC_DEFUN([AC_WIRESHARK_PCAP_CHECK],
# but we may have to look for the header in a "pcap"
# subdirectory of "/usr/include" or "/usr/local/include",
# as some systems apparently put "pcap.h" in a "pcap"
# subdirectory, and we also check "$prefix/include" - and
# subdirectory without also providing a "pcap.h" in the top-level
# include directory, and we also check "$prefix/include" - and
# "$prefix/include/pcap", in case $prefix is set to
# "/usr/include" or "/usr/local/include".
#